The Conservatives lost all thirteen seats they had held previously, leaving the party without Westminster representation from Wales for the first time since 2005.

[1] The Parliamentary Voting System and Constituencies Act 2011, as amended by the Parliamentary Constituencies Act 2020, mandated the number of seats in Wales be reduced from 40 to 32 to more accurately reflect its share of registered voters, including one coterminous with the Isle of Anglesey.

[3] On 28 June 2023, the Boundary Commission for Wales published its final recommendations for the new Welsh constituencies.

The dates for these opinion polls range from the 2019 general election on 12 December to the present day.

By the share of the vote (14.8 per cent), Plaid Cymru achieved their best ever result in UK general election.

[26] The Liberal Democrats gained one seat in Wales, Brecon, Radnor and Cwm Tawe.